ios - 解码 Storyboard 时访问错误导致崩溃

Question

我收到了 2 份崩溃报告，其中的回溯痕迹似乎表明解码 Storyboard中的图像引用存在问题。在此设备上报告

我无法在运行 7.1 的 iPhone 5 或运行 7.0 的模拟器中重现它。我正在使用 7.1 SDK、 Storyboard和 Assets 目录。

第一条日志是这样的:

EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x9000000c

Thread : Crashed: com.apple.main-thread
0  libobjc.A.dylib  0x39c9ab66 objc_msgSend + 5
1  CoreGraphics     0x2f9bbc09 CGImageRetain + 16
2  UIKit            0x320d742b -[UIImage initWithCGImage:scale:orientation:] + 114
3  UIKit            0x320d739f +[UIImage imageWithCGImage:scale:orientation:] + 62
4  UIKit            0x320e2c4b -[_UIAssetManager imageNamed:scale:idiom:subtype:cachingOptions:] + 334
5  UIKit            0x320e2af7 -[_UIAssetManager imageNamed:scale:idiom:subtype:] + 38
6  UIKit            0x320e2acd -[_UIAssetManager imageNamed:idiom:subtype:] + 44
...

第二个略有不同:

Thread : Crashed: com.apple.main-thread
0  libobjc.A.dylib  0x39c9ab66 objc_msgSend + 5
1  CoreUI           0x33a7bd0d -[CUIStructuredThemeStore renditionWithKey:] + 1052
2  CoreUI           0x33a850af -[CUINamedImage _renditionForSpecificKey:] + 170
3  CoreUI           0x33a850fd -[CUINamedImage image] + 20
4  UIKit            0x320e2c01 -[_UIAssetManager imageNamed:scale:idiom:subtype:cachingOptions:] + 260
5  UIKit            0x320e2af7 -[_UIAssetManager imageNamed:scale:idiom:subtype:] + 38
6  UIKit            0x320e2acd -[_UIAssetManager imageNamed:idiom:subtype:] + 44

从第 6 行开始的其余跟踪对于两个崩溃日志都是通用的。

7  UIKit            0x320e2a9b -[_UIAssetManager imageNamed:idiom:] + 46
8  UIKit            0x32427ab1 -[UIImageNibPlaceholder initWithCoder:] + 288
9  UIKit            0x324bd1d9 UINibDecoderDecodeObjectForValue + 740
10 UIKit            0x324bceef -[UINibDecoder decodeObjectForKey:] + 90
11 UIKit            0x3241b4bd -[UIButtonContent initWithCoder:] + 296
12 UIKit            0x324bd1d9 UINibDecoderDecodeObjectForValue + 740
13 UIKit            0x324bd557 UINibDecoderDecodeObjectForValue + 1634
14 UIKit            0x324bceef -[UINibDecoder decodeObjectForKey:] + 90
15 UIKit            0x3241d613 -[UIButton initWithCoder:] + 594
16 UIKit            0x324bd1d9 UINibDecoderDecodeObjectForValue + 740
17 UIKit            0x324bceef -[UINibDecoder decodeObjectForKey:] + 90
18 UIKit            0x32426bf9 -[UIRuntimeConnection initWithCoder:] + 112
19 UIKit            0x3242723f -[UIRuntimeEventConnection initWithCoder:] + 42
20 UIKit            0x324bd1d9 UINibDecoderDecodeObjectForValue + 740
21 UIKit            0x324bd179 UINibDecoderDecodeObjectForValue + 644
22 UIKit            0x324bceef -[UINibDecoder decodeObjectForKey:] + 90
23 UIKit            0x324263f5 -[UINib instantiateWithOwner:options:] + 888
24 UIKit            0x323880fb -[UIViewController _loadViewFromNibNamed:bundle:] + 234
25 UIKit            0x321e9b59 -[UIViewController loadView] + 92
26 UIKit            0x320cb79d -[UIViewController loadViewIfRequired] + 72
27 UIKit            0x320cb719 -[UIViewController view] + 24
28 UIKit            0x321412a3 -[UIViewController viewControllerForRotation] + 58
29 UIKit            0x32141209 -[UIViewController _visibleView] + 76
30 UIKit            0x321b0fb5 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:animation:] + 4604
31 UIKit            0x321af631 -[UIViewController presentViewController:withTransition:completion:] + 4676
32 FaceInvaders     0x0000e885 -[RSHomeViewController tableView:didSelectRowAtIndexPath:] (RSHomeViewController.m:93)
33 UIKit            0x321e40cb -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1078
34 UIKit            0x32297863 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 214
35 UIKit            0x32147781 _applyBlockToCFArrayCopiedToStack + 316
36 UIKit            0x320bf7bb _afterCACommitHandler + 430
37 CoreFoundation   0x2f90df69 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 20
38 CoreFoundation   0x2f90b8f7 __CFRunLoopDoObservers + 286
39 CoreFoundation   0x2f90bc43 __CFRunLoopRun + 738
40 CoreFoundation   0x2f876471 CFRunLoopRunSpecific + 524
41 CoreFoundation   0x2f876253 CFRunLoopRunInMode + 106
42 GraphicsServices 0x345b02eb GSEventRunModal + 138
43 UIKit            0x3212b845 UIApplicationMain + 1136
44 FaceInvaders     0x00017fa1 main (main.m:16)

任何可能导致此问题的想法或我如何调试它？

Answer 1

我想我找到了问题所在， Storyboard包含此标记:

<image name="pressed" width="1" height="1"/>

而实际图像是 1x80 像素。

大概某些版本的 iOS 信任 Storyboard 并分配不正确大小的缓冲区，而其他版本则进行某种边界检查。

所以解决方案是检查 <resources> storybaord 的 XML 末尾的标记，用于不正确的尺寸。如果有，请删除图像并重新添加。如果这不起作用，请完全删除图像并改为在代码中加载它。